My understanding is that it's not necessarily a flight from one aiport to another, that is over 50NM, rather that one of the points of landing has a distance over 50NM from the original point of departure.
Based on that understanding, if the landing destination of Leg1 "OR" the landing destination of Leg2 "OR" the landing destination of Leg3 has a straight-line distance of more than 50NM from your departure airport (any of them), you can log it "ALL" as cross country (1.6 Hobbs)
There is an intepretation response on the FAA site, that might help: http://www.faa.gov/about/office_org/headquarters_offices/agc/pol_adjudication/agc200/interpretations/data/interps/2009/Louis%20Glenn.pdf
The key take-away is:
Section 61.1 (b)(3)(ii), in relevant part, defines cross-country time for the purposes of meeting the aeronautical experience for a private pilot certificate, a commercial pilot certificate, an instrument rating, or for the exercise of recreational pilot privileges. For these purposes, cross-country time is time acquired during a flight conducted in an appropriate aircraft that includes a point of landing that was at least a straight-line distance of more than 50 nm from the original point of departure and that involves the use of dead reckoning, pilotage, electronic navigation aids, radio aids, or other navigation systems to navigate to the landing point.
Hope that helps!
Best Regards,
Todd